Cr₂O₃+6HNO₃= 2Cr( NO₃)₃+3H₂O
n( Cr₂O₃)= 18/152= 0,11
n ( HNO₃)= 0,11*6= 0,66 моль
m ( HNO₃)= 0,66*63= 41,58
m ( раствора )= 41,58 г/ 0,1= 415, 8 г.
1) Ba + O2 =BaO2) BaO + 2HCL = BaCl2 +H2O3) BaCl2 + H2O = Ba(OH)2 + HCl4)Ba(OH)2 + H3PO4 = Ba3(PO4)2 H2O
5)Ba3(PO4)2 + H2SO4 =Ba(SO4)2 + H3PO4